Theoretical and Experimental Investigation of a 2 × 2 MIMO OFDM Radio-Over-Fiber System at 60-GHz with I/Q Imbalance Compensation

Chun Hung Ho, Chun-Ting Lin, Tsung Hung Lu, Hou Tzu Huang, Boris Po Tsung Shih, Chia Chien Wei, Anthony Ngoma

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

This paper investigates the efficacy of two methods for compensating I/Q imbalance, which causes serious performance problems in wideband (6.98-GHz spectrum) millimeter-wave systems employing MIMO signal transmission. A 60-GHz orthogonal frequency division multiplexing (OFDM) RoF system employing 2 × 2 MIMO technology is implemented using a commonly used training symbol arrangement and a proposed method. We experimentally demonstrate that the proposed training symbol arrangement performed significantly better than the commonly used approach. By combining the proposed training symbol arrangement with LMS I/Q compensation and bit-loading, we achieve an extremely high wireless data rate transmission of 75.211 Gb/s over both 50 km of standard single-mode fiber and 3.5-m wireless distance. The optical power penalty after 50-km fiber transmission was only ∼1 dB.

Original languageEnglish
Article number6818995
Pages (from-to)3901-3909
Number of pages9
JournalJournal of Lightwave Technology
Volume32
Issue number20
DOIs
StatePublished - 15 Oct 2014

Keywords

  • Channel estimation
  • Least squares approximations
  • MIMO
  • OFDM
  • Training
  • Vectors
  • Wireless communication

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